There is a female-male connector that connects the wire harness from engine to the cab located in passenger side kick panel. Find it and disconnect them. Look at each side to see if the connector is burnt. If it is it will need to be replaced or you can cut the rear defrost wire away from the connector and connect them direct. To much amperage causes these to burn out. If joining them direct do it cleanly and at your own risk. You can check the current at the rear defrost to see if this is the issue. front defrost is supplied by heated air. Rear is an electric coil on the window.
SOURCE: Front defrost wont work
See this post:
http://www.fixya.com/cars/t1142051-hvac_control_head_mode_dial
SOURCE: my defroster is blowing out hot air but not defrosting my window
Bizarre. It is blowing hot air? If so are there vents you can change direction towards windshield?
SOURCE: Defroster & floor blowers don't work but front facing vents do
There are what they call mode door's these days they have a electrical motor that turnes the door to different posistions...sounds like yours is become broken. It would depend on your expertise in the ac & heating system area to replace the part. Sometimes easy and most of the times the dash has to be removed.
SOURCE: front windshield defroster on my 96 chevy truck doesnt work
defrost dorr is not opening check to see if cable clamp has broken or if works off vaccum check for broken vacum line. berrydalewolfe
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